LANDOVER – Even before Osi Umenyiora’s recent sack surge, the Giants were sure he was a rising star, and so in September they opened negotiations on a new contract. The numbers continued to rise as Umenyiora’s stock soared. The final tally – a six-year deal worth $33 million, signed Friday night.

“He’s an outstanding player who has a chance to be a great player and we wanted to keep him here,” GM Ernie Accorsi said yesterday prior to the Giants’ 35-20 loss to the Redskins. “It’s still so early in his football life. The sky’s the limit how good he can be.”

With a wide range of incentives and salary escalators added into the final years of the contract – which locks Umenyiora up through the 2012 season – the deal can be worth nearly $41 million. There is $15 million in guaranteed money.

Umenyiora, 25, entered yesterday’s game against the Redskins with 12½ sacks, tops in the NFC. He did not get a sack in the game.

*

There was a lack of judgment by Jeremy Shockey with four minutes left in the second quarter. As Shockey broke into his route, linebacker Lemar Marshall gave him a forearm to the face. Immediately, an angered Shockey turned and complained to the closest official, giving up on the play as Manning fired a pass intended for his tight end.

Shockey’s blunder was Marshall’s gift, as Manning threw where he thought Shockey would be and Marshall came away with an interception. Shockey was forced in and out of the game with an ankle injury.

“The thing of it is, whether it is or it isn’t [a penalty] the result is terrible,” Tom Coughlin said.

The Giants were down by 15 when with 6:19 left a 36-yard TD pass to Amani Toomer was called back by a holding penalty on guard Chris Snee, who was flagged to bringing down DE Renaldo Wynn.

“I tripped, he fell over me,” Snee said. “But if they called it, it’s my mistake.” C Shaun O’Hara was less diplomatic: “There were a couple of calls, there’s some guys who should be getting coal in their stocking,” O’Hara said of the officials. . . . WR Plaxico Burress dropped what should have been a 50-yard TD on the very first play, as he beat S Ryan Clack and the pass from Eli Manning was delivered perfectly. “I didn’t make the play, I didn’t come up with it,” Burress said. . . . Second-year LB Reggie Torbor was benched in favor of little-used Alonzo Jackson in the second quarter, not long after Torbor did not make a play on a 13-yard run by Clinton Portis.